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Composite phase-change material for mobile heat supply and preparation method thereof

A composite phase change material and nanomaterial technology, which is applied in the field of composite phase change materials for mobile heating, can solve the problems of reducing the heat transfer effect of composite phase change materials, and achieves overcoming poor heat transfer performance and fast heat storage and release speed. , the effect of improving thermal conductivity

Active Publication Date: 2013-05-22
QINGDAO AOHUAN NEW ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is mainly to add nano-metal materials of millimeter, micron and larger size to the phase change material to improve the thermal conductivity. Due to the large density difference between the metal and the phase change material, after the composite phase change material is melted, These metal solid particles are very easy to precipitate in the mixed molten salt, which greatly reduces the enhanced heat transfer effect of the composite phase change material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh four kinds of salts according to the mass ratio of lithium nitrate, sodium nitrate, sodium nitrite and lithium fluoride as 38:20:12:30, mechanically stir them evenly, put them into a vacuum heating furnace for heating and melting, the temperature of the vacuum heating furnace is controlled 40-50°C above the mixed salt phase transition temperature. Will account for 0.5% of the total mass of Al with a particle size of 10nm 2 o 3 Mixed particles with SiC are added to the molten mixed salt, the temperature of the vacuum heating furnace is controlled at 40-50°C above the phase transition temperature of the mixed salt, and the melt is magnetically stirred for 40 minutes to prepare a uniform and stable nanocomposite phase transition Material. The nanocomposite phase change material in molten state can be directly and quickly filled into the energy storage tank of the mobile heating vehicle through the bottom feeding port. After the filling is completed, close the vacu...

Embodiment 2

[0022] Weigh four kinds of salts according to the mass ratio of lithium nitrate, sodium nitrate, sodium nitrite and lithium fluoride as 42:21:10:28, mechanically stir them evenly, put them into a vacuum heating furnace for heating and melting, the temperature of the vacuum heating furnace is controlled 40-50°C above the mixed salt phase transition temperature. Will account for 0.8% of the total mass of Al with a particle size of 10nm 2 o 3 Mixed particles with SiC are added to the molten mixed salt, the temperature of the vacuum heating furnace is controlled at 40-50°C above the phase transition temperature of the mixed salt, and the melt is magnetically stirred for 80 minutes to prepare a uniform and stable nanocomposite phase transition Material. The nanocomposite phase change material in molten state can be directly and quickly filled into the energy storage tank of the mobile heating vehicle through the bottom feeding port. After the filling is completed, close the vacu...

Embodiment 3

[0024] Weigh four kinds of salts according to the mass ratio of lithium nitrate, sodium nitrate, sodium nitrite and lithium fluoride as 45:18:10:27, mechanically stir them evenly, put them into a vacuum heating furnace for heating and melting, the temperature of the vacuum heating furnace is controlled 40-50°C above the mixed salt phase transition temperature. 1.1% of the total mass of Al with a particle size of 10nm 2 o 3 Mixed particles with SiC are added to the molten mixed salt, the temperature of the vacuum heating furnace is controlled at 40-50°C above the phase transition temperature of the mixed salt, and the melt is magnetically stirred for 150 minutes to prepare a uniform and stable nanocomposite phase transition Material. The nanocomposite phase change material in molten state can be directly and quickly filled into the energy storage tank of the mobile heating vehicle through the bottom feeding port. After the filling is completed, close the vacuum heating furna...

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Abstract

The invention discloses a composite phase-change material for mobile heat supply and a preparation method thereof. The composite phase-change material is formed by compounding 97.5-99.5 wt% of mixed inorganic salts and 0.5-2.5 wt% of non-metal nano material. The preparation method comprises the following steps: mixing a plurality of inorganic salts according to mass ratio, stirring, adding into a vacuum heating furnace, and heating into a molten state, wherein the temperature of the vacuum heating furnace is controlled at 40-50 DEG C higher than the phase-change temperature of the mixed inorganic salts; and adding the non-metal nano material into the molten salts, and magnetically stirring for more than half an hour to prepare the uniform and stable molten-state composite phase-change material. Compared with the prior art, the composite phase-change material disclosed by the invention has the advantages of high heat-conducting property, high heat accumulation density, small volume shrinkage and the like, can satisfy different application requirements, and is especially suitable for moderate-temperature waste heat recovery.

Description

technical field [0001] The invention relates to a composite phase change material for mobile heat supply and a preparation method of the composite phase change material, belonging to the technical field of phase change thermal storage materials. Background technique [0002] With the continuous development of society, human beings' demand for energy is increasing day by day, but the supply and demand of energy have a strong stage, and in many cases it cannot be used rationally, resulting in a large waste of energy. At this time, some Materials store part of the energy in the form of heat. With the enhancement of people's awareness of energy conservation and environmental protection, energy-saving materials have attracted more and more attention in the field of waste heat recovery. Phase change materials absorb or release a large amount of heat in the process of phase change (solid-liquid or solid-solid) to realize energy conversion. It has high energy storage density and hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCY02P20/10
Inventor 赵海龙
Owner QINGDAO AOHUAN NEW ENERGY GRP CO LTD
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